Application of electrochemical impedance spectroscopy in sensor systems, devices, and related methods
First Claim
1. A method of performing real-time sensor diagnostics on a subcutaneous or implanted sensor having at least one working electrode, comprising:
- (a) performing a first electrochemical impedance spectroscopy (EIS) procedure to generate a first set of impedance-related data for the at least one working electrode, said first set of impedance-related data including a first dataset for at least one impedance-related parameter that is substantially glucose independent;
(b) after a predetermined time interval, performing a second EIS procedure to generate a second set of impedance-related data for the at least one electrode, said second set of impedance-related data including a second dataset for said at least one impedance-related parameter that is substantially glucose-independent;
(c) based only on said first and second datasets, determining whether the sensor is functioning normally; and
(d) based on said determination, sending an alert to a user of the sensor that the sensor should be replaced when the sensor is not functioning normally.
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Abstract
A diagnostic Electrochemical Impedance Spectroscopy (EIS) procedure is applied to measure values of impedance-related parameters for one or more sensing electrodes. The parameters may include real impedance, imaginary impedance, impedance magnitude, and/or phase angle. The measured values of the impedance-related parameters are then used in performing sensor diagnostics, calculating a highly-reliable fused sensor glucose value based on signals from a plurality of redundant sensing electrodes, calibrating sensors, detecting interferents within close proximity of one or more sensing electrodes, and testing surface area characteristics of electroplated electrodes. Advantageously, impedance-related parameters can be defined that are substantially glucose-independent over specific ranges of frequencies. An Application Specific Integrated Circuit (ASIC) enables implementation of the EIS-based diagnostics, fusion algorithms, and other processes based on measurement of EIS-based parameters.
121 Citations
20 Claims
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1. A method of performing real-time sensor diagnostics on a subcutaneous or implanted sensor having at least one working electrode, comprising:
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(a) performing a first electrochemical impedance spectroscopy (EIS) procedure to generate a first set of impedance-related data for the at least one working electrode, said first set of impedance-related data including a first dataset for at least one impedance-related parameter that is substantially glucose independent; (b) after a predetermined time interval, performing a second EIS procedure to generate a second set of impedance-related data for the at least one electrode, said second set of impedance-related data including a second dataset for said at least one impedance-related parameter that is substantially glucose-independent; (c) based only on said first and second datasets, determining whether the sensor is functioning normally; and (d) based on said determination, sending an alert to a user of the sensor that the sensor should be replaced when the sensor is not functioning normally. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of performing real-time sensor diagnostics on a subcutaneous or implanted sensor having at least one working electrode, comprising:
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(a) performing a first electrochemical impedance spectroscopy (EIS) procedure to generate a first set of impedance-related data for the at least one working electrode; (b) after a predetermined time interval, performing a second EIS procedure to generate a second set of impedance-related data for the at least one electrode, wherein each of the first and second sets of impedance-related data includes values for impedance-related parameters; (c) based on the first and second sets of impedance-related data, determining whether the sensor is functioning normally, wherein said determination comprises comparing the value of at least one impedance-related parameter from the first set of impedance-related data to the value of the same parameter from the second set of impedance-related data; and (d) based on said determination, sending an alert to a user of the sensor that the sensor should be replaced when the sensor is not functioning normally. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification